Scrubs are the shirts an trousers or gowns worn by nurses, surgeons, and other operating room personnel when "scrubbing in" for surgery. The wearing of scrubs has been extended outside of surgery in many hospitals. Scrubs are now worn by any hospital personnel in any clean environment. The spread of Methicillin-resistant Staphylococcus aureus (MRSA) has increased the necessity and usage of scrubs. They have also been mandated in some American prisons as a prison uniform. The television show Scrubs is named for the medical garments worn by hospital personel.